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Old 06-11-2013, 10:44   #1 (permalink)
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confused crown vic needs a little more oomph

I drive an 04 Crown Vic LX Sport as a daily driver. I was curious what performance modifications would provide the most bang for the bang when trying to improve low speed straight line performance.

Basically, what should I modify/replace in order to have a better 0-60 time while still keeping a full interior.

I've changed the stock air filter (to a K&N), and the car has a dual exhaust stock. I have heard that changing the rear end drive ratio is a good place to start (from stock to the police spec one (3.73 I think).

Change to an aftermarket dual exhaust? Change the rear end? ECU flash/re-map(it's an automatic, sadly)? Ignition timing? Underdrive pullies?
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Old 06-11-2013, 17:20   #2 (permalink)
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Re: crown vic needs a little more oomph

The timing will be modified in a tune, all will help, but without any major mods to the engine itself, you most immediate noticeable change would be with the rear, but you'll give up some one the highway and top end.
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Old 06-11-2013, 22:01   #3 (permalink)
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Re: crown vic needs a little more oomph

I'm not too concerned about highway speed, I just want it to get off the line and go a bit better. I believe a supercharger kit is overkill but I am open to other major engine modifications though I am not very familiar with Fords 4.6L and what works well and what doesn't.
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Old 06-12-2013, 18:44   #4 (permalink)
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Re: crown vic needs a little more oomph

To get the full benefit of the supercharger, you're also going to want to go with different heads and bigger exhaust. I think your's is 2", I'd consider stepping up to about 2 1/2". Also remember that if you're wanting to go forced induction, you have to watch your compression ratio. Typically, a stock block won't take high compression ratio and a super charger that will be jacking up the compression even further.

What's your goal with this? Drag racing?
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Old 06-13-2013, 17:36   #5 (permalink)
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Re: crown vic needs a little more oomph

As Stroker McGurk said, "speed costs, how fast do you want to go?"
I too have a charcoal grey '05 sport, one of a few with factory sunroof.

Not a lot can be done with the 4.6, and if you go too steep on the rear gears, your PCM, speed control, not to mention gas mileage, will be a problem.

Torque is what moves these two ton cars and a 5.4 is the way to go. I have built and installed two 5.4's in CV's, and they will fry the tires with stock 3.23 gears. A stock 5.4 is a dog, but you can gain an extra 100 HP and even more torque with Trick Flow heads (use the small CC heads for higher comp ratio) and cams. Degree the cams, I found them to be off a couple of degrees out of the box, use the stock intake with adaptor plates and a 70MM throttle body. Keep the stock exhaust, but remove the resonators. Make sure your trans is in good shape and don't forget to turn off the traction control. All else is bolt up, except the exhaust "H" pipe will have to be widened about 1/2-3/4 (wait until you get it in and measure).

Your C/V will never be fast, but you will gain the respect of every BM(W?) and MB driver in the neighborhood! The down side, plan on 5 G's if you do it all yourself.
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